JP5148352B2 - Canister - Google Patents

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JP5148352B2
JP5148352B2 JP2008115659A JP2008115659A JP5148352B2 JP 5148352 B2 JP5148352 B2 JP 5148352B2 JP 2008115659 A JP2008115659 A JP 2008115659A JP 2008115659 A JP2008115659 A JP 2008115659A JP 5148352 B2 JP5148352 B2 JP 5148352B2
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heat storage
storage material
adsorption chamber
canister
adsorbent
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JP2009264273A (en
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隆司 小杉
正孝 鈴木
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愛三工業株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407Constructional details of adsorbing systems
    • B01D53/0415Beds in cartridges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407Constructional details of adsorbing systems
    • B01D53/0438Cooling or heating systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702Hydrocarbons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/40083Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40086Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/45Gas separation or purification devices adapted for specific applications
    • B01D2259/4516Gas separation or purification devices adapted for specific applications for fuel vapour recovery systems

Description

  The present invention relates to an evaporative fuel processing apparatus canister that prevents evaporative fuel generated from a fuel tank from being released into the atmosphere, and in particular, by utilizing latent heat together with an adsorbent capable of adsorbing and desorbing evaporative fuel. The heat storage material which suppresses the temperature change of an adsorbent is related with the canister accommodated in the adsorption chamber.

  Conventionally, evaporative fuel generated by volatilization of gasoline fuel stored in a fuel tank while the vehicle is stopped, etc. is adsorbed and captured by an adsorbent made of activated carbon, etc., to prevent the evaporated fuel from being released into the atmosphere. There is a canister for the fuel processor. The canister is provided with a tank port communicating with the upper part of the fuel tank, an atmospheric port whose tip is open to the atmosphere, and a purge port through which evaporated fuel desorbed (purged) from the adsorbent flows. It has been. Evaporated fuel generated when the temperature of the fuel tank rises when the engine is driven or when the vehicle is stopped is adsorbed by the adsorbent while flowing from the tank port into the canister and flowing toward the atmospheric port. Thus, the evaporated fuel is prevented from being released into the atmosphere. The evaporated fuel adsorbed by the adsorbent is desorbed (purged) by introducing air from the air port by an intake pipe negative pressure when the engine is driven and a suction pump that is driven and controlled independently of the engine drive. The adsorbent is regenerated.

  At this time, the fuel vapor is liquefied when adsorbed on the adsorbent in the canister, and vaporizes again when desorbed from the adsorbent. Therefore, when the evaporated fuel is adsorbed, the temperature of the adsorbent increases due to condensation heat that is an exothermic reaction, and when the evaporated fuel is desorbed, the temperature of the adsorbent decreases due to vaporization heat that is an endothermic reaction. On the other hand, the adsorbent that is a porous body has a characteristic that the adsorption capacity increases as the temperature decreases, and the adsorption capacity decreases as the temperature increases. Therefore, in order to improve the adsorption / desorption performance of the adsorbent, it is desired to suppress the temperature change of the adsorbent by suppressing the heat generation / endotherm accompanying the phase change of the evaporated fuel.

  Therefore, Patent Document 1 discloses a canister in which a heat storage material that suppresses a temperature change of an adsorbent using latent heat is accommodated in an adsorbing chamber together with the adsorbent. In the heat storage material of Patent Document 1, a plurality of microcapsules enclosing a phase change material are formed into pellets (short cylindrical shape) by a binder, and the pellet-shaped heat storage material is also granulated into a pellet shape. Along with the adsorbed material, the adsorbent is mixed and accommodated. Thereby, the temperature rise of the adsorbent when the evaporated fuel is adsorbed is suppressed by the latent heat (melting heat) when the phase change material in the heat storage material changes from the solid phase to the liquid phase, while the evaporated fuel Adsorption / desorption performance of the adsorbent is achieved by suppressing the temperature drop of the adsorbent during desorption by the latent heat (heat of solidification) when the phase change material in the heat storage material changes from the liquid phase to the solid phase. Will improve.

  On the other hand, Patent Documents 2 and 3 are canisters in which a heat storage material having a predetermined shape is held and fixed in an adsorption chamber. These heat storage materials are made of a material having a higher thermal conductivity and specific heat (heat capacity) than the adsorbent, and suppress the temperature change of the adsorbent by sensible heat. Specifically, the heat storage material of Patent Document 2 uses a metal plate mainly made of metal such as iron, and combines a plurality of metal plates or processes a single metal plate into a predetermined shape. Thus, it is held between two opposing surfaces that define the adsorption chamber. Since the heat storage material made of a metal plate is arranged in a state that intersects the flow direction of the evaporated fuel (shields the flow path of the evaporated fuel), a large number of pores are formed in the heat storage material to ensure air permeability. Is drilled. In Patent Document 3, an aluminum wire mesh is held in an adsorption chamber in a spiral state.

JP-A-2005-233106 JP-A 63-246462 Japanese Patent Laid-Open No. 8-4605

  By the way, the temperature change suppression effect of the adsorbent by the heat storage material is greatly influenced by the quality of heat transfer from the adsorbent to the heat storage material. That is, if the temperature change of the adsorbent is not transmitted well to the heat storage material, the amount of absorption and release of latent heat in the heat storage material corresponding to this is reduced, and the temperature change of the adsorbent cannot be suppressed well. One of the important factors regarding the heat transferability from the adsorbent to the heat storage material is that the distance between the adsorbent and the heat storage material is always substantially constant.

  However, in Patent Document 1, a plurality of heat storage materials granulated in a pellet form are only contained in a mixed and dispersed state in the adsorption chamber together with the adsorbent. In this case, the heat storage material moves due to vibration during traveling, etc., and the heat storage material is unevenly distributed in the adsorption chamber, which may cause uneven distribution. As a result, the distance between the adsorbent and the heat storage material also varies, and it becomes impossible to efficiently suppress the temperature change of the adsorbent. In addition, if the distribution of the heat storage material becomes non-uniform, a portion having a high temperature change suppressing effect and a portion not having the temperature change suppressing effect are formed, and the temperature change of the entire adsorbent cannot be uniformly suppressed.

  On the other hand, in Patent Document 2 and Patent Document 3, since the heat storage material formed in a predetermined shape is held in the adsorption chamber, the heat storage material does not move greatly due to vibration during traveling, and the heat storage material and the adsorbent. The distance between and is always kept substantially constant. However, since the heat storage materials of Patent Document 2 and Patent Document 3 only use sensible heat consumed to change the temperature without causing a phase change of the substance, the latent heat accompanying the phase change of the substance is used. Compared to the heat storage material, the temperature change suppression effect of the adsorbent is greatly inferior. Moreover, since the heat storage material of patent document 2 and patent document 3 is a metal, there exists a limit in a moldability and it is not suitable for making it complicated shapes, such as a honeycomb shape especially. Moreover, operations such as assembling a plurality of metal plates into a predetermined shape as in Patent Document 2 and winding a wire mesh in a spiral shape as in Patent Document 3 are complicated and inferior in productivity.

  Therefore, the present invention solves the above-mentioned problems, and the object of the present invention is to make the distribution of the heat storage material non-uniform even when vibration is applied, and to make the distance between the heat storage material and the adsorbent substantially constant. A canister that can be maintained and is highly productive.

  In a canister in which an adsorbent that adsorbs / desorbs evaporative fuel in an adsorption chamber and a heat storage material that absorbs / releases latent heat according to a temperature change are accommodated, and the heat storage material includes a plurality of phase change substances. The microcapsule is a molded body integrally formed into a predetermined shape by a binder, and the heat storage material has a size that is close to or in contact with two opposing surfaces that define the adsorption chamber. It is characterized by being held between two surfaces. The two opposing surfaces that define the adsorption chamber correspond to the upper and lower surfaces of the adsorption chamber, the front and rear sides, and the left and right side surfaces. Of these surfaces, it may be held between at least one pair of surfaces.

  At this time, it is preferable that the heat storage material is disposed along the flow direction of the evaporated fuel.

  The said heat storage material can be shape | molded in the plate shape which can be hold | maintained between two opposing side surfaces which divide the said adsorption | suction chamber, ie, the front-and-back surface, or a right-and-left side surface, for example. In this case, it is preferable that a plurality of the heat storage materials are arranged in parallel in the adsorption chamber at equal intervals.

  The heat storage material may be formed in a column shape having a height dimension that can be held between upper and lower surfaces that define the adsorption chamber, and having a space extending in a height direction in which the evaporated fuel can flow. . The columnar shape having a space extending in the height direction in which the evaporated fuel can flow is typically a cylindrical shape or a rectangular tube shape, but in addition, a honeycomb shape having a number of elongated pores, a plurality of plates Also, an arrow-blade shape is arranged at regular intervals in the 360 ° circumferential direction from the central axis.

  Further, the heat storage material is formed in a column shape having a space extending in a height direction in which the evaporated fuel can flow, and when the heat storage material is accommodated in the adsorption chamber, the heat storage material contacts the side surface of the adsorption chamber. It is more preferable to have a dimension to

  According to the present invention, since the heat storage material that absorbs and releases latent heat accompanying the phase change of the phase change material is used, the temperature change of the adsorbent is suppressed compared to the case where the heat storage material using sensible heat is used. High effect. Since the heat storage material is formed by integrally forming a plurality of microcapsules with a binder, the degree of freedom in design and productivity are high. In addition, since the heat storage material is held in the adsorption chamber, the heat storage material is not greatly displaced even if vibration is applied to the canister. Thereby, the distance between the heat storage material and the adsorbent can be kept substantially constant without the heat storage material being unevenly distributed.

  If the heat storage material is arranged along the flow direction of the evaporated fuel, the air permeability of the canister is prevented from being obstructed, the adsorption / desorption ability of the canister is not lowered, and the air permeability is ensured. Therefore, there is no need for secondary processing of the heat storage material.

  In the case where the heat storage material is plate-shaped, if a plurality of heat storage materials are arranged side by side at equal intervals, the heat storage material can be arranged uniformly over the entire adsorption chamber, and the distance between the adsorption material and the heat storage material is also Get closer. Thereby, the temperature change of an adsorbent can be suppressed efficiently and canister performance can also be improved.

  If the columnar heat storage material has a height dimension that can be held by the upper and lower surfaces of the adsorption chamber, the heat storage material can be evenly distributed throughout the adsorption chamber and the vertical displacement is reliable. To be prevented. Furthermore, if the heat storage material is also in contact with the side surface of the adsorption chamber, displacement in the left-right direction is reliably prevented.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. However, the present invention is not limited thereto, and various modifications can be made without departing from the scope of the present invention. In the following description, for convenience of explanation, the vertical and horizontal directions of the canister are defined based on the illustrated state, but these directions also change depending on the installation direction of the canister.
Example 1
FIG. 1 shows a longitudinal side view of a canister 1 according to Embodiment 1 of the present invention, and FIG. 2 shows a cross-sectional plan view of the canister 1 according to Embodiment 1 of the present invention. The canister 1 according to the first embodiment is installed in an evaporative fuel processing apparatus generated from a fuel tank of an automobile. As shown in FIGS. 1 and 2, the canister 1 is made of a synthetic resin and has a hollow square cylindrical shape. A canister case 10 and a synthetic resin cover 11 that closes a bottom opening of the canister case 10 are provided. The canister case 10 and the cover 11 are formed of the same material such as nylon, and are joined by, for example, vibration welding or adhesion in a state where the flanges 10a and 11a are abutted. On the upper surface of the canister case 10, a cylindrical tank port 13 serving as an evaporative fuel introduction portion and a cylindrical purge port 14 through which the desorbed evaporative fuel flows are integrally formed so as to penetrate inside and outside. Has been. On the other hand, a cylindrical atmosphere port 15 that communicates with the atmosphere and serves as an inlet / outlet of the atmosphere (air) is integrally formed in the cover 11 on the side opposite to the tank port 13 and the like so as to penetrate inside and outside. Thus, the canister 1 has one adsorption chamber 21 in which a substantially straight flow path extending between the tank port 13 and the purge port 14 and the atmospheric port 15 is formed. Although not shown, the tank port 13 communicates with the upper part of the fuel tank, and the purge port 14 communicates with the intake pipe of the engine (internal combustion engine) or is driven and controlled independently of the engine drive. The fuel tank communicates with the suction pump.

  Metal plates 19u and 19l having air permeability are arranged on the upper and lower sides in the canister case 10, respectively, and filters 17u and 17l having air permeability are provided inside the upper and lower plates 19u and 19l, respectively. Is arranged. A space defined by the side wall 10b of the canister case 10 and the upper and lower filters 17u and 17l serves as an adsorption chamber 21, and an adsorbent 18 capable of adsorbing and desorbing evaporated fuel in the adsorption chamber 21 A heat storage material 22 that accommodates absorption / release of latent heat in response to a temperature change is accommodated. That is, the front and rear and left and right surfaces of the adsorption chamber 21 are defined by the side walls 10b, and the upper and lower surfaces of the adsorption chamber 21 are defined by the upper and lower filters 17u and 17l. The upper plate 19u is received by a step portion 10c provided on the upper portion of the side wall 10b of the canister case 10. On the other hand, the lower plate 19l is always urged toward the tank port 13 by a coil spring 20 disposed between the lower plate 19l and the cover 11. Thereby, the adsorbent 18 is accommodated and held without variation. The filter 17 is made of a synthetic resin nonwoven fabric or urethane foam. The plate 19 is a plate or mesh having a large number of pores.

  As the adsorbent 18, a porous body having a large number of pores capable of adsorbing and holding evaporated fuel molecules is used, and activated carbon is typically used. The adsorbent 18 of Example 1 is formed by granulating and molding a plurality of fine powdery activated carbon into a pellet (short cylindrical shape) with a binder, and is dispersedly accommodated throughout the adsorption chamber 21. Has been. The pellet-shaped adsorbent 18 may be about 1 to 3 mm in diameter and about 1 to 5 mm in length. Since the adsorbent 18 is in the form of a pellet, when the adsorbent 18 is accommodated in the adsorption chamber 21, an appropriate gap is secured between the adsorbents 18. It is ensured that the pressure loss and the adsorption / desorption action are not impaired. The adsorbent 18 may be in the form of a pellet, as well as a spherical shape, a polygonal shape, a flat shape, etc., as long as the adsorbent 18 has a shape that can secure a void when accommodated in the adsorption chamber 21.

In the heat storage material 22, a plurality of fine microcapsules 23 including a phase change material 24 are formed into a flat plate shape by a binder. As shown in FIG. 3, the microcapsule 23 includes a hollow spherical outer shell 25 (microcapsule) in which a phase change material 24 that absorbs and releases latent heat according to a temperature change is enclosed. It is manufactured by a known method such as a coacervation method or an in-situ method (interface reaction method) using 24 as a core material. The phase change material 24 is not particularly limited as long as it is a material that can change between a solid phase and a liquid phase in accordance with the temperature change of the adsorbent 18, and is not limited to an organic compound or inorganic material having a melting point of about 10 to 80 ° C. Compounds can be used. Specifically, linear aliphatic hydrocarbons such as tetradecane, pentadecane, hexadecane, heptadecane, octadecane, nonadecane, eicosan, heicosan, docosan, natural wax, petroleum wax, LiNO 3 3H 2 O, Na 2 SO 4・ Hydrates of inorganic compounds such as 10H 2 O and Na 2 HPO 4 · 12H 2 O, fatty acids such as capric acid and lauric acid, higher alcohols having 12 to 15 carbon atoms, methyl valmitate, methyl stearate, etc. And the like. Among them, it is preferable to use a phase change material having a melting point of about 20 ° C. Examples of the phase change material 24 include hexadecane having a melting point of 18 ° C. and heptadecane having a melting point of 22 ° C. These phase change materials 24 may be used alone or in combination of two or more. The outer shell 25 can be formed of melamine resin, styrene resin, polyorganosiloxane, gelatin or the like. Among these, melamine resin is preferable. As the binder, various thermosetting resins can be used, but a phenol resin and an acrylic resin are preferable from the viewpoint of temperature and strength required as a final canister.

  The heat storage material 22 is obtained by kneading the plurality of microcapsules 23 with a binder and extruding it into a flat plate shape, and then cutting it into predetermined dimensions. The heat storage material 22 has substantially the same width as the left and right width of the adsorption chamber 21, and both left and right ends thereof are fitted into a pair of rail-shaped grooves 10 d that are integrally formed on the inner surfaces of the left and right side walls 10 b of the canister case 10. As a result, the canisters 1 are arranged along the longitudinal direction. That is, the heat storage material 22 is held along the flow direction of the evaporated fuel between two opposing side surfaces that define the adsorption chamber 21. Further, the length of the heat storage material 22 is the same as the height of the adsorption chamber 21, and the upper and lower ends of the heat storage material 22 are held in contact with the upper and lower filters 17u and 17l, respectively. Thereby, even if a vibration is applied to the canister 1, the heat storage material 22 is not displaced in the vertical and horizontal directions. A plurality of pairs of rail-shaped grooves 10d (three pairs in the first embodiment) are arranged in parallel at equal intervals, and one heat storage material 22 is fitted to each of the rail-shaped grooves 10d. A plurality of (three in the first embodiment) flat heat storage materials 22 are provided in the chamber 21 at equal intervals. A large number of adsorbents 18 are densely accommodated in the adsorption chamber 21 so as to surround each flat heat storage material 22.

  Next, the operation of the canister 1 according to the first embodiment will be described. When the temperature of the fuel tank is raised due to the high temperature atmosphere when the vehicle is stopped or the engine drive heat when the vehicle is running, the temperature of the gasoline stored in the fuel tank is also raised and a large amount of evaporated fuel is generated. The evaporated fuel generated in the fuel tank is introduced into the canister 1 from the tank port 13 and flows in the adsorption chamber 21 linearly toward the atmospheric port 15, and is accommodated in the adsorption chamber 21 in the meantime. The adsorbent 18 is adsorbed. At this time, the evaporated fuel is liquefied when adsorbed on the adsorbent 18. Then, the temperature of the adsorbent 18 rises due to the heat of solidification of the evaporated fuel, and the adsorption capacity (adsorption capacity) decreases as it is. However, since the heat storage material 22 is accommodated in the adsorption chamber 21 together with the adsorbent 18, the phase change material 24 in the heat storage material 22 undergoes a phase change from the solid phase to the liquid phase due to the temperature rise of the adsorbent 18, and the latent heat. As a result, the temperature rise of the adsorbent 18 is suppressed.

  When the inside of the canister 1 becomes negative pressure by the intake pipe negative pressure or the suction pump, the atmosphere (outside air) is sucked from the atmosphere port 15 and the evaporated fuel adsorbed by the adsorbent 18 is desorbed (purged). Flows in the opposite direction and is discharged from the purge port 14. At this time, the evaporated fuel is vaporized when it is desorbed from the adsorbent 18. Then, the temperature of the adsorbent 18 decreases due to the heat of vaporization of the evaporated fuel, and the adsorption capacity (adsorption capacity) decreases as it is. However, the temperature change of the adsorbent 18 is suppressed because the phase change material in the heat storage materials 22 and 23 changes from the liquid phase to the solid phase due to the temperature drop of the adsorbent 18 to generate heat due to latent heat.

  As described above, the temperature change of the adsorbent 18 is suppressed by the heat storage material 22, but at this time, the left and right ends of the heat storage material 22 are firmly held by the rail-shaped groove 10 d provided on the side wall 10 b of the canister case 10. In addition, since the upper and lower ends of the heat storage material 22 are also held by the upper and lower filters 17u and 17l, the heat storage material 22 is not displaced in the adsorption chamber 21 even if vibration is applied to the canister 1. Therefore, since the distance between the heat storage material 22 and the adsorbent 18 is always kept substantially constant, the temperature suppression effect is satisfactorily exhibited.

(Example 2)
FIG. 4 shows a vertical side view of the canister 1 according to the second embodiment of the present invention, and FIG. 5 shows a front view of the second shape heat storage material 52. In the canister 1 of the first embodiment, the heat storage material 22 formed in a flat plate shape is used, but a plate-shaped heat storage material 52 having irregularities on the front and back surfaces can also be used. Specifically, as shown in FIGS. 4 and 5, a plurality of protrusions 52 a are integrally formed on the front and back surfaces of a flat plate-shaped heat storage material 52. Thereby, the temperature change suppression function improves because the surface area of the heat storage material 52 increases. The direction of the protrusion 52a may be the left-right direction, but the vertical direction along the flow direction of the evaporated fuel is preferable so as not to impair air permeability. The number of the protrusions 52a is not particularly limited and may be one or more, but is preferably as many as possible. When arranging the plurality of protrusions 52a in parallel, it is preferable to arrange them at regular intervals.

  In the heat storage material 52 used in the canister 1 of the second embodiment, a plurality of fine microcapsules 23 are kneaded with a binder and integrally formed by injection molding. Alternatively, the protrusions and protrusions (projections 52a) can be formed by extrusion molding into a slightly thick flat plate, followed by press molding. Furthermore, you may extrusion-mold as each ridge 52a in the shape where it is formed over the upper and lower ends of the thermal storage material 52. FIG. Since the holding structure and operation of the heat storage material 52 are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

(Example 3)
FIG. 6 shows a longitudinal front view of a canister 3 according to Embodiment 3 of the present invention, and FIG. 7 shows a cross-sectional plan view of the canister 3 according to Embodiment 3 of the present invention. In the third embodiment, a heat storage material is arranged in a canister 3 having two adsorption chambers 38 and 39 therein and having a U-shaped flow path. Specifically, as shown in FIGS. 6 and 7, the canister 3 according to the third embodiment includes a canister case 30 that is made of a synthetic resin and has a hollow cylindrical shape, and a synthetic resin that closes the bottom opening of the canister case 30. And a cover 31 made of metal. The canister case 30 and the cover 31 are formed of the same material such as nylon, and are joined by, for example, vibration welding or adhesion in a state where the flanges 30a and 31a are abutted. In the canister 3 of the third embodiment, a tank port 33, a purge port 34, and an atmospheric port 35 are integrally formed on the upper surface of the canister case 30 in this order. A long partition wall 37 extending vertically from the upper surface of the canister case 30 to the vicinity of the cover 31 is integrally formed between the purge port 34 and the atmospheric port 35. By the partition wall 37, the inside of the canister 3 is partitioned into a first adsorption chamber 38 on the tank port 33 side and a second adsorption chamber 39 on the atmospheric port 35 side. As a result, a U-shaped flow path in which the tank port 33, the purge port 34 and the atmospheric port 35 communicate with each other via the lower side of the partition wall 37 is formed in the canister 3. A short auxiliary partition 40 extending from the upper surface of the canister case 30 toward the cover 31 is also integrally formed between the tank port 33 and the purge port 34.

  Metal plates 41u and 41l having air permeability are arranged at the upper and lower portions in the canister case 30, respectively, and filters 42u and 42l having air permeability are provided inside the upper and lower plates 41u and 41l, respectively. Is arranged. Thus, the first adsorption chamber 38 and the second adsorption chamber 39 are partitioned by the side walls 30b and the partition walls 37, and the upper and lower surfaces are partitioned by the upper and lower filters 42u and 42l. The upper plate 41 u is received by a step portion 30 c provided on the upper portion of the side wall 30 b of the canister case 30. On the other hand, the lower plate 41 l is constantly urged toward the tank port 33 by a coil spring 43 disposed between the lower plate 41 l and the cover 31. Thereby, the adsorbent 18 is accommodated and held without variation. As in the first and second embodiments, the filter 42 is made of synthetic resin nonwoven fabric or urethane foam. The plate 41 is a plate or mesh having a large number of pores.

  The first adsorption chamber 38 is a substantially quadrangular prism-shaped space, and a plurality of (three in this embodiment) heat storage materials 52 as in the second embodiment are stored in the first adsorption chamber 38. The pellet-shaped adsorbents 18 are densely accommodated so as to be arranged in parallel at intervals and to surround each heat storage material 52. The heat storage material 52 of the third embodiment is also fitted in a rail-shaped groove 30 d formed integrally with the side wall 30 b and the partition wall 37 of the canister case 30. The lower end of the heat storage material 52 is in contact with the lower filter 42 l, but the upper end of the heat storage material 52 is in contact with the lower end of the auxiliary partition wall 40.

  On the other hand, the second adsorption chamber 39 is a cylindrical space, and a third column formed in the second adsorption chamber 39 has a column shape having a space extending in a height direction in which the evaporated fuel can flow. A shape heat storage material 53 is accommodated. Specifically, the heat storage material 53 has a plurality of (six in the third embodiment) flat plates 53a in the shape of arrow feathers arranged at equal intervals in the 360 ° circumferential direction from the central axis, and between the flat plates 53a. The adsorbent 18 is closely packed in the space. The heat storage material 53 has the same height as the second adsorption chamber 39 and is in contact with the upper and lower filters 42 u and 42 l that define the upper and lower surfaces of the second adsorption chamber 39 and is displaced in the vertical direction. Not to be held. The outer diameter of the heat storage material 53 is substantially the same as the inner diameter of the second adsorption chamber 39, and the outer surface of the heat storage material 53 (the tip of each flat plate 53 a) is in contact with the inner surface of the second adsorption chamber 39, It is held so as not to be displaced in the horizontal direction. The heat storage material 53 having the third shape is also obtained by kneading a plurality of fine microcapsules 23 with a binder, extrusion molding, and cutting into predetermined dimensions. Since the operation in the third embodiment is basically the same as that in the first and second embodiments, the description thereof is omitted.

(Other variations)
As described above, the heat storage material having a typical shape that can be accommodated in the substantially square columnar adsorption chamber or the columnar adsorption chamber has been described, but various other shapes of the heat storage material can be used. Specifically, in the third embodiment, the heat storage material 53 including the six flat plates 53a is used. However, the number of flat plates forming the arrow-shaped heat storage material is not particularly limited, and may be three or more. Preferably, it is in the shape of an arrow blade having about eight flat plates 54a like the fourth shape heat storage material 54 shown in FIG. By increasing the number of flat plates, the contact area between the heat storage material and the adsorbent increases, and the temperature change suppression function is improved.

  Moreover, it can also be set as the hollow cylinder shape and square cylinder shape which upper and lower surfaces open like the 5th shape heat storage material 55 shown in FIG. 9, and the 6th shape heat storage material 56 shown in FIG. It is preferable that a cylindrical heat storage material 55 be accommodated in the columnar adsorption chamber, and a square cylindrical heat storage material 56 be accommodated in the square columnar adsorption chamber. Further, as in the seventh shape heat storage material 57 shown in FIG. 11 and the eighth shape heat storage material 58 shown in FIG. 12, a cylindrical or square cylindrical hollow space is partitioned by a plurality of plates 57a and 58a. Can also be used. According to this, the contact area between the heat storage material and the adsorbent is increased, the temperature change suppression function is improved, and the temperature change can be uniformly suppressed. Further, like the ninth shape heat storage material 59 shown in FIG. 13 and the tenth shape heat storage material 60 shown in FIG. 14, a cylindrical or square cylindrical hollow space is divided into a large number of elongated thin cells. A honeycomb-shaped member having holes 59a and 60a can also be used. According to this, the contact area between the heat storage material and the adsorbent is further increased, the temperature change suppression function is further improved, and the temperature change can be more uniformly suppressed. In addition, when using the honeycomb-shaped heat storage materials 59 and 60, the small diameter adsorbent 18 is filled. Moreover, it can also be set as a shape which has a some cylinder or square cylinder inside and outside like the 11th shape heat storage material 61 shown in FIG. 15, and the 12th shape heat storage material 62 shown in FIG. In the heat storage material 61 and the heat storage material 62, the cylinders are connected to each other by connecting pieces 61a and 62a. These cylindrical heat storage materials 55 to 62 are also obtained by kneading many fine microcapsules with a binder and extrusion molding. In addition, when accommodating a square cylinder-shaped heat storage material in a quadrangular columnar adsorption chamber, a rail-shaped groove is not necessary.

  In the case of using a columnar heat storage material in a large sense like the third to twelfth shape heat storage materials 53 to 62, it has at least a height dimension that can be held between the upper and lower surfaces defining the adsorption chamber. If so, the outer diameter may be smaller than the inner diameter of the adsorption chamber. Even in such a case, since the upper and lower ends of the heat storage material are held by the upper and lower surfaces that define the adsorption chamber, it is difficult to shift the position in the horizontal direction due to vibration.

1 is a longitudinal side view of a canister according to Embodiment 1. FIG. 1 is a cross-sectional plan view of a canister according to Embodiment 1. FIG. It is a partially broken front view of a microcapsule. 6 is a cross-sectional plan view of a canister according to Embodiment 2. FIG. It is a front view of the 2nd shape heat storage material. 6 is a longitudinal front view of a canister according to Embodiment 3. FIG. 6 is a cross-sectional side view of a canister according to Embodiment 3. FIG. It is a perspective view of the 4th shape heat storage material. It is a perspective view of the 5th shape heat storage material. It is a perspective view of the 6th shape heat storage material. It is a top view of the 7th shape heat storage material. It is a top view of the 8th shape heat storage material. It is a top view of the 9th shape heat storage material. It is a top view of the 10th shape heat storage material. It is a top view of the 11th shape heat storage material. It is a top view of the 12th shape heat storage material.

Explanation of symbols

1.3 Canister 10/30 Canister case 10a / 30a Flange 10b / 30b Side wall 10c / 30c Step 10d / 30d Rail-shaped groove 11/31 Cover 11a / 31a Flange 13/33 Tank port 14/34 Purge port 15/35 Atmosphere Port 17/42 Filter 18 Adsorbent 19/41 Plate 20/43 Coil spring 21 Adsorption chamber 22, 52/53/54/55/56/57/58/59/60/61/62 Heat storage material 23 Microcapsule 24 Phase Change material 25 Outer shell 37 Partition 38 First adsorption chamber 39 Second adsorption chamber 40 Auxiliary partition 52a Projection 53a / 54a Flat plate 57a / 58a Plate 59a / 60a Fine pore 61a / 62a Connecting piece

Claims (4)

  1. In a canister in which an adsorbent that adsorbs / desorbs evaporated fuel in an adsorption chamber and a heat storage material that absorbs / releases latent heat according to temperature changes are accommodated.
    The heat storage material is a molded body independent of a canister case , in which a plurality of microcapsules enclosing a phase change material are integrally molded into a predetermined shape by a binder,
    The heat storage material has a size in contact with or close to two opposing surfaces that define the adsorption chamber, and is held between the two opposing surfaces,
    The binder Ri der thermosetting resin,
    The canister characterized in that the heat storage material is disposed along the flow direction of the evaporated fuel .
  2. The heat storage material is molded into a plate shape that can be held between two opposing side surfaces that define the adsorption chamber,
    The canister according to claim 1, wherein a plurality of the heat storage materials are arranged in parallel in the adsorption chamber at equal intervals.
  3.   The heat storage material has a height dimension that can be held between upper and lower surfaces that define the adsorption chamber, and is formed in a column shape having a space extending in a height direction in which evaporated fuel can flow. The canister according to 1.
  4. The heat storage material is formed in a column shape having a space extending in a height direction in which the evaporated fuel can flow,
    The canister according to claim 1 or 3, wherein when the heat storage material is accommodated in the adsorption chamber, the heat storage material is in contact with a side surface of the adsorption chamber.

JP2008115659A 2008-04-25 2008-04-25 Canister Active JP5148352B2 (en)

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JP2008115659A JP5148352B2 (en) 2008-04-25 2008-04-25 Canister
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